/**

 * Copyright (c) 2014-present, Facebook, Inc.

 *

 * This source code is licensed under the MIT license found in the

 * LICENSE file in the root directory of this source tree.

 */



var regeneratorRuntime = (function (exports) {

    "use strict";
  
  
  
    var Op = Object.prototype;
  
    var hasOwn = Op.hasOwnProperty;
  
    var undefined; // More compressible than void 0.
  
    var $Symbol = typeof Symbol === "function" ? Symbol : {};
  
    var iteratorSymbol = $Symbol.iterator || "@@iterator";
  
    var asyncIteratorSymbol = $Symbol.asyncIterator || "@@asyncIterator";
  
    var toStringTagSymbol = $Symbol.toStringTag || "@@toStringTag";
  
  
  
    function wrap(innerFn, outerFn, self, tryLocsList) {
  
      // If outerFn provided and outerFn.prototype is a Generator, then outerFn.prototype instanceof Generator.
  
      var protoGenerator = outerFn && outerFn.prototype instanceof Generator ? outerFn : Generator;
  
      var generator = Object.create(protoGenerator.prototype);
  
      var context = new Context(tryLocsList || []);
  
  
  
      // The ._invoke method unifies the implementations of the .next,
  
      // .throw, and .return methods.
  
      generator._invoke = makeInvokeMethod(innerFn, self, context);
  
  
  
      return generator;
  
    }
  
    exports.wrap = wrap;
  
  
  
    // Try/catch helper to minimize deoptimizations. Returns a completion
  
    // record like context.tryEntries[i].completion. This interface could
  
    // have been (and was previously) designed to take a closure to be
  
    // invoked without arguments, but in all the cases we care about we
  
    // already have an existing method we want to call, so there's no need
  
    // to create a new function object. We can even get away with assuming
  
    // the method takes exactly one argument, since that happens to be true
  
    // in every case, so we don't have to touch the arguments object. The
  
    // only additional allocation required is the completion record, which
  
    // has a stable shape and so hopefully should be cheap to allocate.
  
    function tryCatch(fn, obj, arg) {
  
      try {
  
        return { type: "normal", arg: fn.call(obj, arg) };
  
      } catch (err) {
  
        return { type: "throw", arg: err };
  
      }
  
    }
  
  
  
    var GenStateSuspendedStart = "suspendedStart";
  
    var GenStateSuspendedYield = "suspendedYield";
  
    var GenStateExecuting = "executing";
  
    var GenStateCompleted = "completed";
  
  
  
    // Returning this object from the innerFn has the same effect as
  
    // breaking out of the dispatch switch statement.
  
    var ContinueSentinel = {};
  
  
  
    // Dummy constructor functions that we use as the .constructor and
  
    // .constructor.prototype properties for functions that return Generator
  
    // objects. For full spec compliance, you may wish to configure your
  
    // minifier not to mangle the names of these two functions.
  
    function Generator() {}
  
    function GeneratorFunction() {}
  
    function GeneratorFunctionPrototype() {}
  
  
  
    // This is a polyfill for %IteratorPrototype% for environments that
  
    // don't natively support it.
  
    var IteratorPrototype = {};
  
    IteratorPrototype[iteratorSymbol] = function () {
  
      return this;
  
    };
  
  
  
    var getProto = Object.getPrototypeOf;
  
    var NativeIteratorPrototype = getProto && getProto(getProto(values([])));
  
    if (NativeIteratorPrototype &&
  
        NativeIteratorPrototype !== Op &&
  
        hasOwn.call(NativeIteratorPrototype, iteratorSymbol)) {
  
      // This environment has a native %IteratorPrototype%; use it instead
  
      // of the polyfill.
  
      IteratorPrototype = NativeIteratorPrototype;
  
    }
  
  
  
    var Gp = GeneratorFunctionPrototype.prototype =
  
      Generator.prototype = Object.create(IteratorPrototype);
  
    GeneratorFunction.prototype = Gp.constructor = GeneratorFunctionPrototype;
  
    GeneratorFunctionPrototype.constructor = GeneratorFunction;
  
    GeneratorFunctionPrototype[toStringTagSymbol] =
  
      GeneratorFunction.displayName = "GeneratorFunction";
  
  
  
    // Helper for defining the .next, .throw, and .return methods of the
  
    // Iterator interface in terms of a single ._invoke method.
  
    function defineIteratorMethods(prototype) {
  
      ["next", "throw", "return"].forEach(function(method) {
  
        prototype[method] = function(arg) {
  
          return this._invoke(method, arg);
  
        };
  
      });
  
    }
  
  
  
    exports.isGeneratorFunction = function(genFun) {
  
      var ctor = typeof genFun === "function" && genFun.constructor;
  
      return ctor
  
        ? ctor === GeneratorFunction ||
  
          // For the native GeneratorFunction constructor, the best we can
  
          // do is to check its .name property.
  
          (ctor.displayName || ctor.name) === "GeneratorFunction"
  
        : false;
  
    };
  
  
  
    exports.mark = function(genFun) {
  
      if (Object.setPrototypeOf) {
  
        Object.setPrototypeOf(genFun, GeneratorFunctionPrototype);
  
      } else {
  
        genFun.__proto__ = GeneratorFunctionPrototype;
  
        if (!(toStringTagSymbol in genFun)) {
  
          genFun[toStringTagSymbol] = "GeneratorFunction";
  
        }
  
      }
  
      genFun.prototype = Object.create(Gp);
  
      return genFun;
  
    };
  
  
  
    // Within the body of any async function, `await x` is transformed to
  
    // `yield regeneratorRuntime.awrap(x)`, so that the runtime can test
  
    // `hasOwn.call(value, "__await")` to determine if the yielded value is
  
    // meant to be awaited.
  
    exports.awrap = function(arg) {
  
      return { __await: arg };
  
    };
  
  
  
    function AsyncIterator(generator) {
  
      function invoke(method, arg, resolve, reject) {
  
        var record = tryCatch(generator[method], generator, arg);
  
        if (record.type === "throw") {
  
          reject(record.arg);
  
        } else {
  
          var result = record.arg;
  
          var value = result.value;
  
          if (value &&
  
              typeof value === "object" &&
  
              hasOwn.call(value, "__await")) {
  
            return Promise.resolve(value.__await).then(function(value) {
  
              invoke("next", value, resolve, reject);
  
            }, function(err) {
  
              invoke("throw", err, resolve, reject);
  
            });
  
          }
  
  
  
          return Promise.resolve(value).then(function(unwrapped) {
  
            // When a yielded Promise is resolved, its final value becomes
  
            // the .value of the Promise<{value,done}> result for the
  
            // current iteration.
  
            result.value = unwrapped;
  
            resolve(result);
  
          }, function(error) {
  
            // If a rejected Promise was yielded, throw the rejection back
  
            // into the async generator function so it can be handled there.
  
            return invoke("throw", error, resolve, reject);
  
          });
  
        }
  
      }
  
  
  
      var previousPromise;
  
  
  
      function enqueue(method, arg) {
  
        function callInvokeWithMethodAndArg() {
  
          return new Promise(function(resolve, reject) {
  
            invoke(method, arg, resolve, reject);
  
          });
  
        }
  
  
  
        return previousPromise =
  
          // If enqueue has been called before, then we want to wait until
  
          // all previous Promises have been resolved before calling invoke,
  
          // so that results are always delivered in the correct order. If
  
          // enqueue has not been called before, then it is important to
  
          // call invoke immediately, without waiting on a callback to fire,
  
          // so that the async generator function has the opportunity to do
  
          // any necessary setup in a predictable way. This predictability
  
          // is why the Promise constructor synchronously invokes its
  
          // executor callback, and why async functions synchronously
  
          // execute code before the first await. Since we implement simple
  
          // async functions in terms of async generators, it is especially
  
          // important to get this right, even though it requires care.
  
          previousPromise ? previousPromise.then(
  
            callInvokeWithMethodAndArg,
  
            // Avoid propagating failures to Promises returned by later
  
            // invocations of the iterator.
  
            callInvokeWithMethodAndArg
  
          ) : callInvokeWithMethodAndArg();
  
      }
  
  
  
      // Define the unified helper method that is used to implement .next,
  
      // .throw, and .return (see defineIteratorMethods).
  
      this._invoke = enqueue;
  
    }
  
  
  
    defineIteratorMethods(AsyncIterator.prototype);
  
    AsyncIterator.prototype[asyncIteratorSymbol] = function () {
  
      return this;
  
    };
  
    exports.AsyncIterator = AsyncIterator;
  
  
  
    // Note that simple async functions are implemented on top of
  
    // AsyncIterator objects; they just return a Promise for the value of
  
    // the final result produced by the iterator.
  
    exports.async = function(innerFn, outerFn, self, tryLocsList) {
  
      var iter = new AsyncIterator(
  
        wrap(innerFn, outerFn, self, tryLocsList)
  
      );
  
  
  
      return exports.isGeneratorFunction(outerFn)
  
        ? iter // If outerFn is a generator, return the full iterator.
  
        : iter.next().then(function(result) {
  
            return result.done ? result.value : iter.next();
  
          });
  
    };
  
  
  
    function makeInvokeMethod(innerFn, self, context) {
  
      var state = GenStateSuspendedStart;
  
  
  
      return function invoke(method, arg) {
  
        if (state === GenStateExecuting) {
  
          throw new Error("Generator is already running");
  
        }
  
  
  
        if (state === GenStateCompleted) {
  
          if (method === "throw") {
  
            throw arg;
  
          }
  
  
  
          // Be forgiving, per 25.3.3.3.3 of the spec:
  
          // https://people.mozilla.org/~jorendorff/es6-draft.html#sec-generatorresume
  
          return doneResult();
  
        }
  
  
  
        context.method = method;
  
        context.arg = arg;
  
  
  
        while (true) {
  
          var delegate = context.delegate;
  
          if (delegate) {
  
            var delegateResult = maybeInvokeDelegate(delegate, context);
  
            if (delegateResult) {
  
              if (delegateResult === ContinueSentinel) continue;
  
              return delegateResult;
  
            }
  
          }
  
  
  
          if (context.method === "next") {
  
            // Setting context._sent for legacy support of Babel's
  
            // function.sent implementation.
  
            context.sent = context._sent = context.arg;
  
  
  
          } else if (context.method === "throw") {
  
            if (state === GenStateSuspendedStart) {
  
              state = GenStateCompleted;
  
              throw context.arg;
  
            }
  
  
  
            context.dispatchException(context.arg);
  
  
  
          } else if (context.method === "return") {
  
            context.abrupt("return", context.arg);
  
          }
  
  
  
          state = GenStateExecuting;
  
  
  
          var record = tryCatch(innerFn, self, context);
  
          if (record.type === "normal") {
  
            // If an exception is thrown from innerFn, we leave state ===
  
            // GenStateExecuting and loop back for another invocation.
  
            state = context.done
  
              ? GenStateCompleted
  
              : GenStateSuspendedYield;
  
  
  
            if (record.arg === ContinueSentinel) {
  
              continue;
  
            }
  
  
  
            return {
  
              value: record.arg,
  
              done: context.done
  
            };
  
  
  
          } else if (record.type === "throw") {
  
            state = GenStateCompleted;
  
            // Dispatch the exception by looping back around to the
  
            // context.dispatchException(context.arg) call above.
  
            context.method = "throw";
  
            context.arg = record.arg;
  
          }
  
        }
  
      };
  
    }
  
  
  
    // Call delegate.iterator[context.method](context.arg) and handle the
  
    // result, either by returning a { value, done } result from the
  
    // delegate iterator, or by modifying context.method and context.arg,
  
    // setting context.delegate to null, and returning the ContinueSentinel.
  
    function maybeInvokeDelegate(delegate, context) {
  
      var method = delegate.iterator[context.method];
  
      if (method === undefined) {
  
        // A .throw or .return when the delegate iterator has no .throw
  
        // method always terminates the yield* loop.
  
        context.delegate = null;
  
  
  
        if (context.method === "throw") {
  
          if (delegate.iterator.return) {
  
            // If the delegate iterator has a return method, give it a
  
            // chance to clean up.
  
            context.method = "return";
  
            context.arg = undefined;
  
            maybeInvokeDelegate(delegate, context);
  
  
  
            if (context.method === "throw") {
  
              // If maybeInvokeDelegate(context) changed context.method from
  
              // "return" to "throw", let that override the TypeError below.
  
              return ContinueSentinel;
  
            }
  
          }
  
  
  
          context.method = "throw";
  
          context.arg = new TypeError(
  
            "The iterator does not provide a 'throw' method");
  
        }
  
  
  
        return ContinueSentinel;
  
      }
  
  
  
      var record = tryCatch(method, delegate.iterator, context.arg);
  
  
  
      if (record.type === "throw") {
  
        context.method = "throw";
  
        context.arg = record.arg;
  
        context.delegate = null;
  
        return ContinueSentinel;
  
      }
  
  
  
      var info = record.arg;
  
  
  
      if (! info) {
  
        context.method = "throw";
  
        context.arg = new TypeError("iterator result is not an object");
  
        context.delegate = null;
  
        return ContinueSentinel;
  
      }
  
  
  
      if (info.done) {
  
        // Assign the result of the finished delegate to the temporary
  
        // variable specified by delegate.resultName (see delegateYield).
  
        context[delegate.resultName] = info.value;
  
  
  
        // Resume execution at the desired location (see delegateYield).
  
        context.next = delegate.nextLoc;
  
  
  
        // If context.method was "throw" but the delegate handled the
  
        // exception, let the outer generator proceed normally. If
  
        // context.method was "next", forget context.arg since it has been
  
        // "consumed" by the delegate iterator. If context.method was
  
        // "return", allow the original .return call to continue in the
  
        // outer generator.
  
        if (context.method !== "return") {
  
          context.method = "next";
  
          context.arg = undefined;
  
        }
  
  
  
      } else {
  
        // Re-yield the result returned by the delegate method.
  
        return info;
  
      }
  
  
  
      // The delegate iterator is finished, so forget it and continue with
  
      // the outer generator.
  
      context.delegate = null;
  
      return ContinueSentinel;
  
    }
  
  
  
    // Define Generator.prototype.{next,throw,return} in terms of the
  
    // unified ._invoke helper method.
  
    defineIteratorMethods(Gp);
  
  
  
    Gp[toStringTagSymbol] = "Generator";
  
  
  
    // A Generator should always return itself as the iterator object when the
  
    // @@iterator function is called on it. Some browsers' implementations of the
  
    // iterator prototype chain incorrectly implement this, causing the Generator
  
    // object to not be returned from this call. This ensures that doesn't happen.
  
    // See https://github.com/facebook/regenerator/issues/274 for more details.
  
    Gp[iteratorSymbol] = function() {
  
      return this;
  
    };
  
  
  
    Gp.toString = function() {
  
      return "[object Generator]";
  
    };
  
  
  
    function pushTryEntry(locs) {
  
      var entry = { tryLoc: locs[0] };
  
  
  
      if (1 in locs) {
  
        entry.catchLoc = locs[1];
  
      }
  
  
  
      if (2 in locs) {
  
        entry.finallyLoc = locs[2];
  
        entry.afterLoc = locs[3];
  
      }
  
  
  
      this.tryEntries.push(entry);
  
    }
  
  
  
    function resetTryEntry(entry) {
  
      var record = entry.completion || {};
  
      record.type = "normal";
  
      delete record.arg;
  
      entry.completion = record;
  
    }
  
  
  
    function Context(tryLocsList) {
  
      // The root entry object (effectively a try statement without a catch
  
      // or a finally block) gives us a place to store values thrown from
  
      // locations where there is no enclosing try statement.
  
      this.tryEntries = [{ tryLoc: "root" }];
  
      tryLocsList.forEach(pushTryEntry, this);
  
      this.reset(true);
  
    }
  
  
  
    exports.keys = function(object) {
  
      var keys = [];
  
      for (var key in object) {
  
        keys.push(key);
  
      }
  
      keys.reverse();
  
  
  
      // Rather than returning an object with a next method, we keep
  
      // things simple and return the next function itself.
  
      return function next() {
  
        while (keys.length) {
  
          var key = keys.pop();
  
          if (key in object) {
  
            next.value = key;
  
            next.done = false;
  
            return next;
  
          }
  
        }
  
  
  
        // To avoid creating an additional object, we just hang the .value
  
        // and .done properties off the next function object itself. This
  
        // also ensures that the minifier will not anonymize the function.
  
        next.done = true;
  
        return next;
  
      };
  
    };
  
  
  
    function values(iterable) {
  
      if (iterable) {
  
        var iteratorMethod = iterable[iteratorSymbol];
  
        if (iteratorMethod) {
  
          return iteratorMethod.call(iterable);
  
        }
  
  
  
        if (typeof iterable.next === "function") {
  
          return iterable;
  
        }
  
  
  
        if (!isNaN(iterable.length)) {
  
          var i = -1, next = function next() {
  
            while (++i < iterable.length) {
  
              if (hasOwn.call(iterable, i)) {
  
                next.value = iterable[i];
  
                next.done = false;
  
                return next;
  
              }
  
            }
  
  
  
            next.value = undefined;
  
            next.done = true;
  
  
  
            return next;
  
          };
  
  
  
          return next.next = next;
  
        }
  
      }
  
  
  
      // Return an iterator with no values.
  
      return { next: doneResult };
  
    }
  
    exports.values = values;
  
  
  
    function doneResult() {
  
      return { value: undefined, done: true };
  
    }
  
  
  
    Context.prototype = {
  
      constructor: Context,
  
  
  
      reset: function(skipTempReset) {
  
        this.prev = 0;
  
        this.next = 0;
  
        // Resetting context._sent for legacy support of Babel's
  
        // function.sent implementation.
  
        this.sent = this._sent = undefined;
  
        this.done = false;
  
        this.delegate = null;
  
  
  
        this.method = "next";
  
        this.arg = undefined;
  
  
  
        this.tryEntries.forEach(resetTryEntry);
  
  
  
        if (!skipTempReset) {
  
          for (var name in this) {
  
            // Not sure about the optimal order of these conditions:
  
            if (name.charAt(0) === "t" &&
  
                hasOwn.call(this, name) &&
  
                !isNaN(+name.slice(1))) {
  
              this[name] = undefined;
  
            }
  
          }
  
        }
  
      },
  
  
  
      stop: function() {
  
        this.done = true;
  
  
  
        var rootEntry = this.tryEntries[0];
  
        var rootRecord = rootEntry.completion;
  
        if (rootRecord.type === "throw") {
  
          throw rootRecord.arg;
  
        }
  
  
  
        return this.rval;
  
      },
  
  
  
      dispatchException: function(exception) {
  
        if (this.done) {
  
          throw exception;
  
        }
  
  
  
        var context = this;
  
        function handle(loc, caught) {
  
          record.type = "throw";
  
          record.arg = exception;
  
          context.next = loc;
  
  
  
          if (caught) {
  
            // If the dispatched exception was caught by a catch block,
  
            // then let that catch block handle the exception normally.
  
            context.method = "next";
  
            context.arg = undefined;
  
          }
  
  
  
          return !! caught;
  
        }
  
  
  
        for (var i = this.tryEntries.length - 1; i >= 0; --i) {
  
          var entry = this.tryEntries[i];
  
          var record = entry.completion;
  
  
  
          if (entry.tryLoc === "root") {
  
            // Exception thrown outside of any try block that could handle
  
            // it, so set the completion value of the entire function to
  
            // throw the exception.
  
            return handle("end");
  
          }
  
  
  
          if (entry.tryLoc <= this.prev) {
  
            var hasCatch = hasOwn.call(entry, "catchLoc");
  
            var hasFinally = hasOwn.call(entry, "finallyLoc");
  
  
  
            if (hasCatch && hasFinally) {
  
              if (this.prev < entry.catchLoc) {
  
                return handle(entry.catchLoc, true);
  
              } else if (this.prev < entry.finallyLoc) {
  
                return handle(entry.finallyLoc);
  
              }
  
  
  
            } else if (hasCatch) {
  
              if (this.prev < entry.catchLoc) {
  
                return handle(entry.catchLoc, true);
  
              }
  
  
  
            } else if (hasFinally) {
  
              if (this.prev < entry.finallyLoc) {
  
                return handle(entry.finallyLoc);
  
              }
  
  
  
            } else {
  
              throw new Error("try statement without catch or finally");
  
            }
  
          }
  
        }
  
      },
  
  
  
      abrupt: function(type, arg) {
  
        for (var i = this.tryEntries.length - 1; i >= 0; --i) {
  
          var entry = this.tryEntries[i];
  
          if (entry.tryLoc <= this.prev &&
  
              hasOwn.call(entry, "finallyLoc") &&
  
              this.prev < entry.finallyLoc) {
  
            var finallyEntry = entry;
  
            break;
  
          }
  
        }
  
  
  
        if (finallyEntry &&
  
            (type === "break" ||
  
             type === "continue") &&
  
            finallyEntry.tryLoc <= arg &&
  
            arg <= finallyEntry.finallyLoc) {
  
          // Ignore the finally entry if control is not jumping to a
  
          // location outside the try/catch block.
  
          finallyEntry = null;
  
        }
  
  
  
        var record = finallyEntry ? finallyEntry.completion : {};
  
        record.type = type;
  
        record.arg = arg;
  
  
  
        if (finallyEntry) {
  
          this.method = "next";
  
          this.next = finallyEntry.finallyLoc;
  
          return ContinueSentinel;
  
        }
  
  
  
        return this.complete(record);
  
      },
  
  
  
      complete: function(record, afterLoc) {
  
        if (record.type === "throw") {
  
          throw record.arg;
  
        }
  
  
  
        if (record.type === "break" ||
  
            record.type === "continue") {
  
          this.next = record.arg;
  
        } else if (record.type === "return") {
  
          this.rval = this.arg = record.arg;
  
          this.method = "return";
  
          this.next = "end";
  
        } else if (record.type === "normal" && afterLoc) {
  
          this.next = afterLoc;
  
        }
  
  
  
        return ContinueSentinel;
  
      },
  
  
  
      finish: function(finallyLoc) {
  
        for (var i = this.tryEntries.length - 1; i >= 0; --i) {
  
          var entry = this.tryEntries[i];
  
          if (entry.finallyLoc === finallyLoc) {
  
            this.complete(entry.completion, entry.afterLoc);
  
            resetTryEntry(entry);
  
            return ContinueSentinel;
  
          }
  
        }
  
      },
  
  
  
      "catch": function(tryLoc) {
  
        for (var i = this.tryEntries.length - 1; i >= 0; --i) {
  
          var entry = this.tryEntries[i];
  
          if (entry.tryLoc === tryLoc) {
  
            var record = entry.completion;
  
            if (record.type === "throw") {
  
              var thrown = record.arg;
  
              resetTryEntry(entry);
  
            }
  
            return thrown;
  
          }
  
        }
  
  
  
        // The context.catch method must only be called with a location
  
        // argument that corresponds to a known catch block.
  
        throw new Error("illegal catch attempt");
  
      },
  
  
  
      delegateYield: function(iterable, resultName, nextLoc) {
  
        this.delegate = {
  
          iterator: values(iterable),
  
          resultName: resultName,
  
          nextLoc: nextLoc
  
        };
  
  
  
        if (this.method === "next") {
  
          // Deliberately forget the last sent value so that we don't
  
          // accidentally pass it on to the delegate.
  
          this.arg = undefined;
  
        }
  
  
  
        return ContinueSentinel;
  
      }
  
    };
  
  
  
    // Regardless of whether this script is executing as a CommonJS module
  
    // or not, return the runtime object so that we can declare the variable
  
    // regeneratorRuntime in the outer scope, which allows this module to be
  
    // injected easily by `bin/regenerator --include-runtime script.js`.
  
    return exports;
  
  
  
  }(
  
    // If this script is executing as a CommonJS module, use module.exports
  
    // as the regeneratorRuntime namespace. Otherwise create a new empty
  
    // object. Either way, the resulting object will be used to initialize
  
    // the regeneratorRuntime variable at the top of this file.
  
    typeof module === "object" ? module.exports : {}
  
  ));